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Alternatives to the typical overpriced options for this application make sense. Each user must decide if the vent tube is worth $100. The general...
I would start looking for a used unit from a salvaged car. I believe that would be the inverter but I'm not sure about the 02.
The 12V is likely toast. If it doesn't keep a charge after slow charging and then after running for a while, start looking for a replacement....
I would probably look at compressor and ICE motor mounts.
Your MPG doesn't seem too bad but it may be improvable. You didn't say if the alignment had been checked or if it pulls or drifts to one side....
Independent Real Estate Appraiser.